Tag: 100-200

Mass spectrometry-based electronic nose to authenticate 100% Italian durum wheat pasta and characterization of volatile compounds was written by Cervellieri, Salvatore;Lippolis, Vincenzo;Mancini, Erminia;Pascale, Michelangelo;Logrieco, Antonio Francesco;De Girolamo, Annalisa. And the article was included in Food Chemistry in 2022.Product Details of 695-06-7 This article mentions the following:

Headspace solid-phase microextraction (HS-SPME) coupled with mass spectrometry-based electronic nose (MS-eNose), in combination with multivariate statistical anal. was used as untargeted method for the rapid authentication of 100% Italian durum wheat pasta. Among the tested classification models, i.e. PCA-LDA, PLS-DA and SVMc, SVMc provided the highest accuracy results in both calibration (90%) and validation (92%) processes. Potential markers discriminating pasta samples were identified by HS-SPME/GC-MS anal. Specifically, the content of a pattern of 8 out of 59 volatile organic compounds (VOCs) was significantly different between samples of 100% Italian durum wheat pasta and pasta produced with durum wheat of different origins, most of which were related to different lipidic oxidation in the two classes of pasta. The proposed MS-eNose method is a rapid and reliable tool to be used for authenticating Italian pasta useful to promote its typicity and preserving consumers from fraudulent practices. In the experiment, the researchers used many compounds, for example, 5-Ethyldihydrofuran-2(3H)-one (cas: 695-06-7Product Details of 695-06-7).

5-Ethyldihydrofuran-2(3H)-one (cas: 695-06-7) belongs to esters. Carboxylic acid esters of low molecular weight are colourless, volatile liquids with pleasant odours, slightly soluble in water. Many esters have the potential for conformational isomerism, but they tend to adopt an s-cis (or Z) conformation rather than the s-trans (or E) alternative, due to a combination of hyperconjugation and dipole minimization effects. The preference for the Z conformation is influenced by the nature of the substituents and solvent, if present. Lactones with small rings are restricted to the s-trans (i.e. E) conformation due to their cyclic structure.Product Details of 695-06-7

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Non-metal Lewis acid-catalyzed cross-Claisen condensation for β-keto esters was written by Zhang, Tianyu;Yang, Zhenkun;Zhou, Dapeng;Meng, Fuliang;Han, Zhengyu;Huang, Hai. And the article was included in Organic & Biomolecular Chemistry in 2021.COA of Formula: C10H11FO2 This article mentions the following:

A new catalytic and highly chemoselective cross-Claisen condensation of esters was disclosed. In the presence of TBSNTf₂ as a non-metal Lewis acid, various esters can undergo cross-Claisen condensation to for/m β-keto esters which are important building blocks. Compared with the traditional Claisen condensation, this process, employing silyl ketene acetals (SKAs) as carbonic nucleophiles to achieve cross-Claisen condensation, requires mild conditions and has good tolerance of functional groups. In the experiment, the researchers used many compounds, for example, Ethyl 2-(4-fluorophenyl)acetate (cas: 587-88-2COA of Formula: C10H11FO2).

Ethyl 2-(4-fluorophenyl)acetate (cas: 587-88-2) belongs to esters. Esters perform as high-grade solvents for a broad array of plastics, plasticizers, resins, and lacquers, and are one of the largest classes of synthetic lubricants on the commercial market. Polyesters are important plastics, with monomers linked by ester moieties. Cyclic esters are called lactones, regardless of whether they are derived from an organic or inorganic acid. One example of an organic lactone is γ-valerolactone.COA of Formula: C10H11FO2

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Apple pathogens: Organic essential oils as an alternative solution was written by Di Francesco, A.;Aprea, E.;Gasperi, F.;Parenti, A.;Placi, N.;Rigosi, F.;Baraldi, E.. And the article was included in Scientia Horticulturae (Amsterdam, Netherlands) in 2022.SDS of cas: 868-57-5 This article mentions the following:

Fusarium avenaceum, Botrytis cinerea, Penicillium expansum, and Neofabraea vagabunda, represent postharvest diseases which cause significant apple losses. The aim of this study was therefore to evaluate the effects of organic essential oils (EOs) (Thymus vulgaris, Lavandula angustifolia, Rosmarinus officinalis) against apple pathogens both in vitro and in vivo, as an integrated management tool. By GC-MS anal. a total of 101 compounds principally belonging to the groups of terpenes and terpenoids were detected in the extracted EOs. In vitro results showed T. vulgaris as the most active EO, both as agar infusion or biofumigant. Through agar infusion, starting from the lowest concentration (0.2 mL L-1), T. vulgaris reduced by 74.9%, 86.1%, 66.9%, and 45.7% F. avenaceum, B. cinerea, P. expansum, and N. vagabunda mycelial growth, resp.; as biofumigant, it completely inhibited the growth of all the tested mycelial pathogens. Application of EOs on apples through dipping treatment displayed some potential to inhibit the above-mentioned pathogens, especially by T. vulgaris and L. angustifolia. The efficacy of these organic EOs is probably strictly correlated to the chem. composition In the experiment, the researchers used many compounds, for example, Methyl2-methylbutyrate (cas: 868-57-5SDS of cas: 868-57-5).

Methyl2-methylbutyrate (cas: 868-57-5) belongs to esters. Carboxylic acid esters of low molecular weight are colourless, volatile liquids with pleasant odours, slightly soluble in water. Acyl chlorides and acid anhydrides alcoholysis is another way to produce esters. Acyl chlorides and acid anhydrides react with alcohols to produce esters. Anydrous conditions are recommended since both acyl chlorides and acid anhydrides react with water.SDS of cas: 868-57-5

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Aroma Properties of Cocoa Fruit Pulp from Different Origins was written by Bickel Haase, Thomas;Schweiggert-Weisz, Ute;Ortner, Eva;Zorn, Holger;Naumann, Susanne. And the article was included in Molecules in 2021.Synthetic Route of C10H18O2 This article mentions the following:

Cocoa pulp occurs as a byproduct of cocoa bean production and can be repurposed to different food applications, such as jams, fruit preparations and beverages, improving the sustainability of cocoa production, as well as the livelihoods of cocoa farmers. In this work, aroma-active compounds of fresh cocoa fruit pulps from different origins were investigated by applying aroma extract dilution analyses in combination with gas chromatog.-mass spectrometry/olfactometry for identification. In total, 65 aroma-active compounds were determined in four different pulps originating from Indonesia, Vietnam, Cameroon, and Nicaragua. Vietnamese pulp showed the highest number of aroma-active regions, while Cameroonian pulp accounted for the lowest. Moreover, Cameroonian cocoa pulp showed the lowest FD factors. Overall, the odorants with the highest FD factors were trans-4,5-epoxy-(E)-decenal, 2- and 3-methylbutanoic acid, 3-(methylthio)propanal, 2-isobutyl-3-methoxypyrazine, (E,E)-2,4-nonadienal, (E,E)-2,4-decadienal, 4-vinyl-2-methoxyphenol, δ-decalactone, 3-hydroxy-4,5-dimethylfuran-2(5H)-one, dodecanoic acid, and linalool. This study provides insights into the aroma composition of fresh cocoa pulp from different origins for future food applications. In the experiment, the researchers used many compounds, for example, 5-Hexyldihydrofuran-2(3H)-one (cas: 706-14-9Synthetic Route of C10H18O2).

5-Hexyldihydrofuran-2(3H)-one (cas: 706-14-9) belongs to esters. Esters perform as high-grade solvents for a broad array of plastics, plasticizers, resins, and lacquers, and are one of the largest classes of synthetic lubricants on the commercial market. Esters are more polar than ethers but less polar than alcohols. They participate in hydrogen bonds as hydrogen-bond acceptors, but cannot act as hydrogen-bond donors, unlike their parent alcohols. This ability to participate in hydrogen bonding confers some water-solubility.Synthetic Route of C10H18O2

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Metal-Free Synthesis of 2-Substituted Quinolines via High Chemoselective Domino Condensation/Aza-Prins Cyclization/Retro-Aldol between 2-Alkenylanilines with β-Ketoesters was written by Nan, Jiang;Chen, Pu;Zhang, Yuxin;Yin, Yun;Wang, Bo;Ma, Yangmin. And the article was included in Journal of Organic Chemistry in 2020.Formula: C9H10O3S This article mentions the following:

A highly chemoselective domino condensation/aza-Prins cyclization/retro-aldol between 2-alkenylanilines with β-dicarbonyl compounds under metal-free conditions was accomplished, giving a large category of valuable 2-substituted quinolines in good yields with excellent functional group toleration. This newly established process, adopting β-ketoesters as masked C1 synthons via C-C cleavage, could even be simplified into a three-component [3 + 2 + 1] domino version consisting of exceedingly low-priced com. starting materials. The synthetic application of products was exemplified by several intriguing chem. operations. In the experiment, the researchers used many compounds, for example, Ethyl 3-oxo-3-(thiophen-2-yl)propanoate (cas: 13669-10-8Formula: C9H10O3S).

Ethyl 3-oxo-3-(thiophen-2-yl)propanoate (cas: 13669-10-8) belongs to esters. Esters are widespread in nature and are widely used in industry. In nature, fats are in general triesters derived from glycerol and fatty acids. Esters are responsible for the aroma of many fruits. Esters are more polar than ethers but less polar than alcohols. They participate in hydrogen bonds as hydrogen-bond acceptors, but cannot act as hydrogen-bond donors, unlike their parent alcohols. This ability to participate in hydrogen bonding confers some water-solubility.Formula: C9H10O3S

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Preparation and chemical behavior of 2-(tert-butoxycarbonyl)amino-3-bromomethyl pyridine, a novel alkylating agent was written by Krasavin, Mikhail;Shkavrov, Sergey;Kravchenko, Dmitry. And the article was included in Synthetic Communications in 2006.Electric Literature of C7H8N2O2 This article mentions the following:

Synthesis of a novel heterocyclic alkylating agent was developed. Its instability toward elevated temperatures and/or polar media can be used to prepare 8-aza-1,4-dihydrobenzo[1,3-d]oxazin-2-one. In the experiment, the researchers used many compounds, for example, Methyl 2-aminonicotinate (cas: 14667-47-1Electric Literature of C7H8N2O2).

Methyl 2-aminonicotinate (cas: 14667-47-1) belongs to esters. Esters perform as high-grade solvents for a broad array of plastics, plasticizers, resins, and lacquers, and are one of the largest classes of synthetic lubricants on the commercial market. Esters contain a carbonyl center, which gives rise to 120° C–C–O and O–C–O angles. Unlike amides, esters are structurally flexible functional groups because rotation about the C–O–C bonds has a low barrier. Their flexibility and low polarity is manifested in their physical properties; they tend to be less rigid (lower melting point) and more volatile (lower boiling point) than the corresponding amides. Electric Literature of C7H8N2O2

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Synthesis and polymerization of alkyl α-(Alkylsulfonyl)acrylates was written by Gipstein, E.;Willson, C. G.;Sachdev, H.. And the article was included in Journal of Organic Chemistry in 1980.COA of Formula: C4H8O4S This article mentions the following:

The reaction of RSO₂CHMeCO₂R¹ (R = Me, CMe₃; R¹ = CMe₃, Me) with PhSeCl gave RSO₂C(SePh)MeCO₂R¹, the selenide products were treated with H₂O₂, and Se-oxidation was followed by an elimination reaction to yield the resp. RSO₂C:(CH₂)CO₂R¹ (I). The deacylative methylenation of MeSO₂CH(COPh)CO₂Me by HCHO gave I (R = R¹ = Me). The I (R¹ = Me) polymerized more readily than the I (R¹ = CMe₃). In the experiment, the researchers used many compounds, for example, Methyl 2-(methylsulfonyl)acetate (cas: 62020-09-1COA of Formula: C4H8O4S).

Methyl 2-(methylsulfonyl)acetate (cas: 62020-09-1) belongs to esters. Volatile esters with characteristic odours are used in synthetic flavours, perfumes, and cosmetics. Certain volatile esters are used as solvents for lacquers, paints, and varnishes. Esters contain a carbonyl center, which gives rise to 120° C–C–O and O–C–O angles. Unlike amides, esters are structurally flexible functional groups because rotation about the C–O–C bonds has a low barrier. Their flexibility and low polarity is manifested in their physical properties; they tend to be less rigid (lower melting point) and more volatile (lower boiling point) than the corresponding amides. COA of Formula: C4H8O4S

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Synthesis and Michael reaction of 3,4-dimethylpyrrole was written by Cheng, D. O.;Bowman, T. L.;LeGoff, E.. And the article was included in Journal of Heterocyclic Chemistry in 1976.COA of Formula: C8H11NO2 This article mentions the following:

MeCH:CHCO2Et and 4-MeC6H4SO2CH2NC gave 3-carbethoxy-4-methylpyrrole, which was reduced with NaAlH2(OCH2CH2OMe)2 to 3,4-dimethylpyrrole (I). Michael addition of Me vinyl ketone and butyn-2-one to I gave the bisadducts, 2,5-bis(3-oxobutyl)-3,4-dimethylpyrrole and 2,5-bis(3-oxobutenyl)-3,4-dimethylpyrrole, resp., while Et propiolate gave only the monoadduct, Et 3-(3,4-dimethylpyrrol-2-yl)propenoate (II). Catalytic reduction of II gave Et 3-(3,4-dimethylpyrrol-2-yl)propanoate, which with Et propiolate gave Et 3-(5-carboethoxyethyl-3,4-dimethylpyrrol-2-yl)propenoate (III). In the experiment, the researchers used many compounds, for example, Ethyl 4-methyl-1H-pyrrole-3-carboxylate (cas: 2199-49-7COA of Formula: C8H11NO2).

Ethyl 4-methyl-1H-pyrrole-3-carboxylate (cas: 2199-49-7) belongs to esters. Esters typically have a pleasant smell; those of low molecular weight are commonly used as fragrances and are found in essential oils and pheromones. Liquid esters of low volatility serve as softening agents for resins and plastics. Esters also include many industrially important polymers. Polymethyl methacrylate is a glass substitute sold under the names Lucite and Plexiglas; polyethylene terephthalate is used as a film (Mylar) and as textile fibres sold as Terylene, Fortrel, and Dacron.COA of Formula: C8H11NO2

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Library Synthesis Using 5,6,7,8-Tetrahydro-1,6-naphthyridines as Scaffolds was written by Zhou, Ya;Beeler, Aaron B.;Cho, Sanghyun;Wang, Yuehong;Franzblau, Scott G.;Snyder, John K.. And the article was included in Journal of Combinatorial Chemistry in 2008.Related Products of 16413-26-6 This article mentions the following:

The chem. of 5,6,7,8-tetrahydro-1,6-naphthyridine scaffolds I [R = H, R¹ = Me, R² = Ph, CH₂OPh, n-Bu; R¹ = Ph, R² = 2-Me-4-MeOC₆H₃], synthesized by intramol. cobalt-catalyzed [2 + 2 + 2] cyclizations, has been exploited for library synthesis. Urea, amide, and sulfonamide formations were used in the synthesis of a 101-membered library. Screening of the library for antituberculosis activity revealed three lead compds I [R = (R)-PhCH(Me)NHCO, 4-MeOC₆H₄NHCO, 4-NCC₆H₄SO₂, R¹ = Ph, R² = 2-Me-4-MeOC₆H₃]. In the experiment, the researchers used many compounds, for example, 3-Cyanophenylisocyanate (cas: 16413-26-6Related Products of 16413-26-6).

3-Cyanophenylisocyanate (cas: 16413-26-6) belongs to esters. Carboxylic acid esters of low molecular weight are colourless, volatile liquids with pleasant odours, slightly soluble in water. Esterification is the general name for a chemical reaction in which two reactants (typically an alcohol and an acid) form an ester as the reaction product. Esters are common in organic chemistry and biological materials.Related Products of 16413-26-6

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Regioselective Syntheses of 1,2-Benzothiazine 1-Imines by Rhodium-Catalyzed Annulation Reactions of Sulfondiimines was written by Bohmann, Rebekka Anna;Schoebel, Jan-Hendrik;Unoh, Yuto;Miura, Masahiro;Bolm, Carsten. And the article was included in Advanced Synthesis & Catalysis in 2019.Computed Properties of C9H10O3S This article mentions the following:

Unprecedented 1,2-benzothiazine 1-imines I (R¹ = H, OMe, Me; R² = Me, cyclopropyl; R³ = H, Me, Ph; R⁴ = Me, thiophen-2-yl, Ph, etc.; R⁵ = H, C(O)OC₂H₅) have been prepared from sulfondiimines 4-R¹C₆H₄S(R²)(=NH)=NR³ by regioselective rhodium-catalyzed annulation reactions with diazo keto esters R⁴C(O)C(=N₂)R⁵ and α-substituted (pseudo)halo acetophenones R⁶CH₂C(O)C₆H₅ (R⁶ = Cl, tosyloxy, mesyloxy) as coupling partners. A representative product was characterized by single crystal X-ray structure anal., and the applicability of the resulting three-dimensional heterocycles I (R¹ = H, R² = Me, R³ = Ph, R⁴ = 4-bromophenyl, R⁵ = H) to Buchwald-Hartwig-type amination reactions is shown. In the experiment, the researchers used many compounds, for example, Ethyl 3-oxo-3-(thiophen-2-yl)propanoate (cas: 13669-10-8Computed Properties of C9H10O3S).

Ethyl 3-oxo-3-(thiophen-2-yl)propanoate (cas: 13669-10-8) belongs to esters. Esters perform as high-grade solvents for a broad array of plastics, plasticizers, resins, and lacquers, and are one of the largest classes of synthetic lubricants on the commercial market. Polyesters are important plastics, with monomers linked by ester moieties. Esterification is the general name for a chemical reaction in which two reactants (typically an alcohol and an acid) form an ester as the reaction product. Esters are common in organic chemistry and biological materials.Computed Properties of C9H10O3S

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics